| City/County | Telephone Area Coce | Postcode |
| Hohhot | 0471 | 010000 |
| Hailaer | 0470 | 021000 |
| Baotou | 0472 | 014000 |
| Wuhai | 0473 | 016000 |
| Jining | 0474 | 012000 |
| Tongliao | 0475 | 028000 |
| Chifeng | 0476 | 024000 |
| Dongsheng | 0477 | 017000 |
| Linhe | 0478 | 015000 |
| Xilinhot | 0479 | 026000 |
| Wulanhot | 04811 | 137400 |
| Manzhouli | 04812 | 021400 |
| erlianhot | 04813 | 012600 |